That's out-of-the-ordinary, based on all the Saudi beheadings I've ever seen (admittedly only six or seven). Of course the same can be said of this kind of beheading as can be said of hanging, electrocution, or almost any other violent method: if you do it correctly, it's good; if not, it can be quite horrendous.
It was on either Newsbusters or Breitbart where I read about it ...